RM0312 datasheet(163/275 Pages) STMICROELECTRONICS

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RM0312

8-bit basic timer (TIM4)

170

8-bit basic timer (TIM4)

18.1

Introduction

The timer consists of an 8-bit auto-reload up-counter driven by a programmable prescaler. It

can be used for time base generation, with interrupt generation on timer overflow.

Refer to Section 17.3 on page 107 for the general description of the timer features.

Figure 64. TIM4 block diagram

18.2

TIM4 main features

The main features include:

•

8-bit up counter auto-reload counter

•

4-bit programmable prescaler allowing dividing (also “on the fly”) the counter clock

frequency by any power of 2 from 1 to 32768.

•

Interrupt generation

–

On counter update: counter overflow

–

On trigger input

18.3

TIM4 interrupts

The timer has 2 interrupt request sources:

•

Update Interrupt (overflow, counter initialization)

•

Trigger input

Prescaler

AutoReload Register

UP-COUNTER

UEV

Stop or Clear

UIF

Reg

event

Legend:

Preload registers transferred

to shadow registers on update

interrupt

CK_PSC

CK_CNT

fMASTER

TGI

TIM4_TRGO

to other timers

ITR = TRC= TRGI

TRGO from TIM3 (ITR2)

TRGO from TIM2 (ITR3)

UEV

control bit

event (UEV) according to

CLOCK/TRIGGER CONTROLLER

TIME BASE UNIT

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